Valve-seat puller



Sept. 30', 1947. c. F. ROBINSON VALVE-SEAT FULLER` INI/NTOR.

Filed May 12., 1944 Patented Sept. 30, 1947 l UNITED a ATES :PATENTf- Aorinar.

A VALVE-SEAT PULLER Charles Francis` Robinson, Carlsbad, Calii?. Application May 12, 1944., Serial No. 535,27 9

3 Claims. (Cl. 29-275') .This invention relates to a' device for pulling valve seats from their counterbores in cylinder heads, cylinder blocks, or the like, of internal combustion engines. The valve seats referred to are of 'ring form and from time to time must be removed and replaced. These valve-seats `are tight in the counterbores that operate as seats for them, and require the. exertion of some force to dislodge them.

One object of this invention is to provide a device of simple construction for accomplishing the pulling, that is, theremoval of such valveseats. A 1

vA device is now inuse for pulling valve-seats that includes an extensible ba'rthat is inserted through theV opening in the seat, placed in a diametrical position and then extended so that its ends bear against the seat at two diametrically opposite points.

' One of the objects of this invention is to produce a tool for this purpose constructed so that the force exerted in pulling the valve seat will be applied substantially all around the periphery of the valve-seat.

In the preferred embodiment of the tool itincludes a collet which in its normal or collapsed condition, is adapted to pass through the opening in the valve-seat, and a means is provided for expanding this collet thereafter to enable it to seat against the inner side of the valve-seat.

`One of the objects is to provide a rotary member for effecting this expansion and to provide the tool with means for preventing its rotation about its own axis when the collet is being vexpanded.'

Further objects of the invention will appear hereinafter.

The invention consists in the novel parts and combination of parts to be described hereinafter, all of which contribute to produce an efficient valve seat puller.

A preferred embodiment of the invention is described in the following speciiication, while the broad scope of the invention is pointed out in the appended claims.

In the drawing,

Fig. 1 is a fragmentary section through a cylinder head and showing an ideal section through this device on the section line I-I indicated in Fig. 2.

Fig. 2 is a rear end view of the tool removed from the cylinder head.

Fig. 3 is a cross section taken about on the line 3--3 of Fig. I and particularly illustrating the mode of operation of the means for preventing rotation of the tool on its own axis when its y handle is being rotated to expand it after it ,hasl

been thrust through` the opening in the valveseat. v Y v In this specification and drawing this invention is described and illustrated as applied to a tool to be used kfor pulling, the valve seats from the cylinderhead of a Diesel type engine.

In practicing the invention, I'provide means,

preferably consisting of a collet I, having a head 2 of circumferential form and this head is of a diameter that will enable it to pass through the.

opening 3 in the valve-seat 4 that is to be pulled out of the counterbore 5 in which it rests. .This counterbore, in the present instance., is formed on the inner face of a cylinder head 6, and is typical of the valve-seats, many of which are usually employe-d in internal combustion engines.

In order to enable the collet head to collapse slightly yto pass through the valve-seat, I prefer to provide it with a plurality of substantially radial slots l, and these slots extend up into the tubular neck 8 of the collet toa point at or near its hub '9 that is iixed on "the, spindle I0 of the.

tool. The tubular neck 8 has acounterbore 1I that is of slightly larger'diameter'than the spindie so as to enable the segments of the neck be tween the slots to spring inwardly. The head `ilV of the collet is formed `with an external bead under which a shoulder I2 is located. The inner face of these valve-seats is usually formed with a beveled face I3, and the shoulder I2 in that case would be similarly beveled, that is, on the same angle.

The tool is provided wi'th'a handle I4 for expanding the collet toseat its shoulder back of the valve-seat and so as to establish a good work- Y ing contact between the shoulder I2 and the valve-seat. For this purpose I prefer to provide expander means in the form of a tapered collar .I5 that seats in a tapered or conical socket I6 in the outer end of the head.

The tool is constructed so that the rotation of the handle I4 will effect the expanding of the head 2, and this is preferably accomplished by providing a threaded shank I1 on the spindle I0, and by forming the handle I4 with a threaded socket to screw onto the end of the threaded shank. When the handle is rotated by means of the cross bar I8 its inner end forces the expander collar I5 inward and spreads the segments 2a, 2b, and 2c of the head.

A washer I9 may be provided between the end of the handle and the butt end of the collar I5 if desired.

The inner end of the spindle I0 operates as a pilot stem to facilitate insertion of the tool in a Y through the opening in the valve-seat when the tool is pulled back by a force exerted on lthe cross bar I8. If the tool sticks, the inner end of the spindle may be struck with a cluborinalf,r let or a piece of soft Wood, to dislodge the valve to receive the blow and at the same time protect the fend of the spindle against being burred over.

The device is preferably provided with means :for preventing it from rotating on its longitudinal axis when Vthe handle I4 is rotated to expand the collet 2'. For this purpose, I prefer to provide the hub 9 of the collet-with a lateral iinger or long pin 2l. This vfinger'sh'ould be short enough to insure thatk it will pass freely through the opening in the valve stem. This iinger may be usedV to secure the collet tothe spindle, in which case its inner end would be :seated ,ina hole 22 drilled in through the hub and the side of the spindle (see Fig. 3). 'I'his pin should be a press fit in this drilled hole,

'When this tool is employed for pulling the valveseats of a Diesel engine head 6, the long pin 2| will engage against the `'tubular housing 23 for the Diesel v injector valve 24. soon Vas this' p in' engages ,the side of this housing, the rotation of the tool on its longitudinal axis will be prevented .and the handle ornut I 4 on the threadof'itho 'shank I1 will tighten up the collar I in the conical socket I 6. Y' l claim as my invention Inavalve-s'e'at puller for removing a valve-.

seat .orthe like from a part carrying the same,

thegconibination of: a spindle; expansible means carried onthe spindle having an annular shoulderlfry engaging the seat; saidmeans Aat said shoulder being of suiiicientlysmall diameter to pass through the opening in the seat; means carried by the expansible means for engaging said part to prevent the expansible `means from rotating;v and a rotatablehandle carried on the outer seat without danger of burring Vup the 'end'of the spindle. If desired, a detachable cap maybe pro- .K vided to be put over the inner end of the spindle end of the spindle; and means actuated by said handle for expanding said expansible means.

2. In a valve-seat puller, the combination of: a spindle; a, collet xed thereon, said collet having substantially radial slots enabling the same to contract and expand, and having shoulders between said slots for engaging the valve-seat; a threaded shank on said spindle; means mounted on said: threaded shank for controlling the said slotted colletto facilitate inserting it and applying it to the valve seat preparatory to pulling the saine; and a pin mounted in the collet and projgcting laterally therefrom for preventing rotationA lof the valve-seat puller on its longitudinal axiswhemthemeans mounted on the threaded shank is being operated to expand the collet.

i 3.In'a' 'valve-seat puller for removing a valveg seat or the like from a part carrying the same,

and having a valve stern guide beyond the seat, the combination of: a spindle; expansible means insertable through the opening in the valve-seat, includingma sleeveoarried on thespindle the inner' end of "said sleeve being located in a position ,to engage said guide so as to stop the .insorting movement vof( the valve-seat puller when tliefsaid` spindle ,has been inserted through the valve-seat opening far enough to bring the expension means past the valve-seat, said expansible means having an annular shoulder for engaging vthe seat and adapted to lie opposite the seat AWhen the end of the said sleeve is engaging the valve stem guide; said expansible means at saidushoulderbeing ofsuiliciently small di' aineterl to pass through the opening in the seat;V

means carried by the expansible `means f0r.en.- gaging said part to prevent the expansible means from `rotating; and rotatable means associated With the spindle for expanding theexpansible mefns .tov engage the valve-seat vto secure the same thereto.

' REFERENCES CITED1 yThe ollowingreferences' are of record in the lCHARLES FRANCIS RornNsoNf- Albertson Apr. 25,V 1933' 

